Multiflame heating head



C. C. ANTHES MULTIFLAME HEATING HEAD Filed Nov. 15, 1947 Aug.`15k,' 195o T, MD/DAWJNMZ rf'grffd J 3. Z

INVENTOR CLIFFORD C. .ANTHES ATTORNEY Patented ug. 15, 195' Clifford C. Anthes, Union, N. J., assignor to The Linde Air Products Company, a corporation of Application November 15, 1947, serial No. 786,299

4This invention relates to heating heads; more particularly to multi-flame heating heads or nozzles of large diameter and suitable for use in heating large areas of comparatively thick metal plates. Y

'Investigation of the heating action of largediameter multi-frame heating heads heretofore in use has demonstrated that the Vvelocity of the ila-mes produced by such heads is too high and `of such a character that the work surface is easily scorched if the-heating head is not moved over-such work surface rapidly to avoid overheatingv and,y consequent damage to the metal. Furthermore, it has been learned that such prior large-diameter multi-frame heating headsA are quite susceptible toflashback.

The principal object of this invention is vto provide an eillcient large-diameter, multi-flame heatinghead or nozzle capableof producing a large number of stable llames of `substantially equal intensity for applying heat uniformly against a considerable surface area of a relatively thick metal workpiece without scorching the `work surface.

accompanying drawings in which;

claims.A (c1. 15s-27.4)

the discharge ports II opens directly into a dis- Fig. l is a central longitudinal sectional View Y of a large-diameter, multi-llame heating head embodying the principles of this invention;

Fig. 2 is a front end view of theheating head, showing the arrangement of'the gas discharge ports; and i Fig. 3 is a sectional View taken on line 3-3 of Fig. 1, showing a portion of the baille plate broken away.

As illustrated by the drawings, the improved heating head comprises a nozzle member N having a single central combustible mixture discharge port I0 arranged coaxially with the central longitudinal axis of the heating head and two circular rows of combustible mixture discharge ports II arranged parallel and concentrically relatively to the central `port I0, all the ports having their outlet orices in the plain front face I2 of the nozzle N to discharge a plurality of gas jets into the atmosphere and produce a multi-jet flame of large pattern and uni- ,form intensity. The entrance end I3 of each of tributing chamber D and maybe tapered to facilitate free ilow of gas into the ports I I and to resist flame propagation back into the annular:

I, vgas-distributing chamber D that supplies gas to the entrances I3 of the ports II.

The combustible gas mixture is discharged into l the chamber D through two concentric rows of ports I4 in an annular baille plate B. The inlet endsv of the ports I4 in the baille plate B openv directly into a mixing and distributing chamber M in a tube T which is attachable at its inlet end to the outlet pipe P of a blowpipe or other. suitable device (not shown) wherein the gases, such as oxygen and acetylene, are initially mixed. to. provide the combustible gas mixture to be supplied to the heating head.

The tube Thas a rear cylindrical inlet section I5, afront cylindrical section I6 of larger diameter than the section I5; and an intermediate truncated conical section II integrally connected to the sections I5 and I6, thereby providing the forwardly ilaring mixing and distributing chamber M in the tube T.

The rear end of the nozzle N has a secton I8 of reduced diameter that lits tightly into the front section I6 of the tube T. The periphery of the nozzle N is secured gas-tightly to the front end of the tube T by a circumferential weld I9 along a shoulder 20 between the smaller diameter nozzle section I8 and the larger diameter nozzle section 2|. The tube section I6 and the nozzle section 2| desirably have the same outside diameter, dimension. Thus, the tube T surrounds orencloses both the ilrst gas chamber M and the second gas chamber D; the nozzle N provides a wall of the second gas chamber D; and the baille plate B provides a wall between and common to the chamber M and the chamber D.

A boss S, preferably integral with the nozzle Nv i andin the formof a cone 22 mounted on a cylindrical base 23, is arranged coaxially vwith the i. central longitudinal axis of the nozzle N and extends inwardly from the rear side of the nozzle and a substantial distance axially into the mixing chamber M. The diameter of the base 23 of the boss S is smaller than that of the inner circle orports I I, and is larger than the bottom of the cone 22 to provide an annular shoulder 24 on the boss S. The inner edge of the baille plate B is supported on the shoulder 24 and is welded to the cone 22 by an annular weld 25, to position the baille plate B in a plane perpendicular to the axis common the nozzle N and the chambers M and D. The outer edge of the baffle plate B ts tightly against the inside of the tube section I6 adjacent the junction of the latter to the tube section I'I. The baie ports I4 communicate directly with an annular portion M' of the mixing chamber M and are arranged in axial alignment with the entrances I3 of the corresponding discharge gas ports I l in the nozzle N. The bale B and its ports serve toevenly distribute, andere?, duce any-turbulence that may be present-in,thegas fiowing from the mixing chamber M to the 10 distributing chamber D thereby assuring better-1 shaped, larger, more stable iiamesfatthedise, charge orifices of ports II. To further improve the character of the flames,-thebaieg;ports.al4a desirably are of smaller diameter thanthe ene trances I3 of the nozzle ports Il and the latter are tapered part way towa1jdther discharge orifices.

Gas is supplied directly from a point well--up-' stream in the mixing chamber M to the central junction With the larger supply passage.- ZSi reges() duces. Vturbulence...and streamlines thegas japx proaching thebaieportsd 4 rand-,the nozzle ,portsiv thus. providing better ashback resistance while aording Arapid v.heat transfer because. of .therein-rr ce'llentiflame stability.. Y

The arrangement oi `theocentraliportlzi .fand-,itsf-.l independent gas supply passagess212'l;fsuppliedx: directlyirom the-rstgaschamber. M, ini cooperation with the concentric. rows.I ofi-ports; I IS. sup-1,..

pliedgdirectlyfrom thel second. gas .chamberrl,islaam-.got` said tub decidedly r. advantageousv because all... theiziiames,r arebette'ri .shaped,.larger and. more -stable,andcarr. be .eiiiciently' .maintainedatA a `lowerflame lyelocity-i to produce a comparatively soft comp.osite.=iiame ofllargeand uniorrnheatingnpatterrn whichere- -1 suits n` a desirableand .eicient Lsoakingi44 :heat l f application.that..will.not:scorch theworlcisurfacen. Moreovenithas `been demonstratedrthat,heating@ operations can ..be..v perf ormed more q.economically because V:of .the .faster .heattransfer V.and superiore ,50

flashback resistance obtainable with; the improved-iheatin'g head ofthisinventioni.

Whatis claimed is: Y

tube enclosing a .first gas `chambenanda ,secondi gas lchamber; a nozzle. having .itsrperiphery` seal; cured.gastightly-,toitharontendof.saidatubeande providinga wall. of. saidl second gaslchamber said? nozzle having a groupioffgasdischarge .ports lead-fA ing; fomsaid. secondgaslchamberto the atmosphere. and a central lg'as-..disclfiz'a,rgeportiiopeningv intolthe .atmosphere a baffle providing. a ,wall be..."

4 tween and common to said first chamber and said second chamber, said baie having ports extending therethrough and connecting such chambers; and a boss secured to said nozzle and extending axially rearwardly therefrom through said second chamber and a substantial distan-ce rearwardly of said baiile and into said rst chamber, saidgboss cooperating 'saidg tiibgegto provide an annular Agaschamber por-tion-adjacent and upstream of the connecting ports in said baile, said boss having a gas passageway extending axially therethroughand communicating with said central 'gas discharge port in said nozzle, said passageway-.having `jaegasrinlet in said nrst chamber upstreamcf saidlannular chamber portion.

2. A multi-arne-heating head as claimed in claim, 1. an d wherein. said boss has a cylindrical portion between saidnozzle and said baie and hasiairearwardly-tapering conical portion within said first gas chamber.

Se A mul,t.-:flan 1.e; heating beadasi gclaimedfin Claim.. Landl reinxsaidiboss-,has a; cylindrical-f.;

portion, and wherein said baille is disposed-ina. plane .-perpendiculargtc-@the axis of saidlbossand SffSe uredfto dlb @fallecen-tinejunctiomofg. Said ylnd-.r al e- 'c and saidbascaV .n:A2;mu1tiea1r1e;heatnse head as.c1aimed eine. Claim; .and whereinsaunaofesaidagas disc-barge; ports; in .Saidiriozzla;v includingfsaid went-rai gas-1 dshareepcrtehas portionthereeiadiagcentuse inlettaperineetcwa its outletiandewhereimsaidia Passager/.an in.-fsa.id;:b0s has a-largerfrdiameter fr than the-@Quint f Saidecentrabgasidschareeportr;

5. A multi-nadie heating-inea as @Mime-@rim 'n said tubffna lindrical claimf 1 :andwheref forwardly:

pertonatiits fronte Hermann-tion scour. .1to1- sa portion ofrred ed acier secured easftigbtlya Withiuasad rien-morti@ bfesaidetubef-.anee Satdbaie nnulareandhasfits;cuter edge :tight1-y tting against the inside of said tub -.adj,acent.1Y

.the junctionzoi the f,.f1aringiand;. cylindrical: pon- Tlrerfollowing vreferences are '.-oferecoifdflinL the leiofnithisl patent: Y

621024 Germany Mar'. v6, 1936mV 

